User`s guide

Chapter 1 Introducing the ZyXEL Device
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1.4.2 VoIP Features
You can register up to 10 SIP (Session Initiation Protocol) accounts and use the ZyXEL
Device to make and receive VoIP telephone calls:
Figure 2 ZyXEL Device’s VoIP Features
• Peer-to-Peer calls (A) - Use the ZyXEL Device to make a call to the recipient’s IP address
without using a SIP proxy server.
• Calls via a VoIP service provider (B) - The ZyXEL Device sends your call to a VoIP
service provider’s SIP server which forwards your calls to either VoIP or PSTN phones.
1.4.3 VoIP Trunking Gateway
VoIP trunking allows you to use your ZyXEL Device as a gateway between VoIP and PSTN
networks.
Figure 3 ZyXEL Device as a VoIP Trunking Gateway
In this example, you use your analog phone (A) to call the ZyXEL Device (B). The ZyXEL
Device changes the call into VoIP and sends it via the Internet to another VoIP phone (C).
Internet
PSTN
A
B
Internet
PSTN
A
C
B